The line was found to be most vulnerable to heavy rain, snow storms and heat-related problems. The M/N Line has seen a "disproportionate share" of climate-caused disruptions in comparison to other lines, according to a statement from ICF.

"This study made long-term climate change information matter to SEPTA," ICF International Senior Vice President Anne Choate said in a statement. "We began with what they are currently experiencing and our investigation into current vulnerabilities allowed for a dialogue across disciplines on how to shore up the entire enterprise to climate and extreme weather risks into the future. As a result, SEPTA is more prepared and its staff is more attuned to climate-related vulnerabilities in the system."